Add modal to help users to manually activate Cost Explorer

[mendaomn]

Description

This PR adds a modal to help users who need to manually enable Cost Explorer.

Following PRs will:

• enable the whole cost monitoring feature with a non-experimental flag
• add e2e spec

Changes

• update useActivateCostMonitoringMutation to delegate handling of error and success
• when Cost Explorer needs to be manually activated, show modal

Screenshot

How Has This Been Tested?

• manually, by mocking both a 400 and a 405
• manually, by mocking a 204
• unit tests

References

• https://docs.aws.amazon.com/cost-management/latest/userguide/ce-enable.html

PR Quality Checklist

• [x] I added tests to new or existing code
• [ ] I removed hardcoded strings and used react-i18next library (useTranslation hook and/or Trans component), see an example here
• [ ] I made sure no sensitive info gets logged at any time in the codebase (see here) (e.g. no user info or details, no stacktraces, etc.)
• [ ] I made sure that any GitHub issue solved by this PR is correctly linked
• [ ] I checked that infrastructure/update_infrastructure.sh runs without any error
• [x] I checked that npm run build builds without any error
• [x] I checked that clusters are listed correctly
• [ ] I checked that a new cluster can be created (config is produced and dry run passes)
• [ ] I checked that login and logout work as expected

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